21936504 has 16 divisors (see below), whose sum is σ = 54841320. Its totient is φ = 7312160.

The previous prime is 21936487. The next prime is 21936521. The reversal of 21936504 is 40563912.

It is an interprime number because it is at equal distance from previous prime (21936487) and next prime (21936521).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456987 + ... + 457034.

Almost surely, 2^21936504 is an apocalyptic number.

21936504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21936504 is an abundant number, since it is smaller than the sum of its proper divisors (32904816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21936504 is a wasteful number, since it uses less digits than its factorization.

21936504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914030 (or 914026 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21936504 is about 4683.6421724978. The cubic root of 21936504 is about 279.9341001375.

The spelling of 21936504 in words is "twenty-one million, nine hundred thirty-six thousand, five hundred four".